Strategic Salmon Health Initiative
In the Pacific Northwest, Chinook, sockeye, coho salmon and steelhead trout have experienced precipitous declines over the past 30 years, with many populations threatened or endangered, and some already extinct. Our program applies a series of novel molecular and ecological approaches to understand the role of infection and disease outbreaks in salmon declines, a difficult task when mortality is mostly unobservable. High throughput pathogen monitoring tools have revealed the distribution and abundance of over 60 potential salmon pathogens (viruses, bacteria, fungal and protozoan parasites) in 28,000 wild, hatchery and cultured salmon.
Since 2013, the Pacific Salmon Foundation has embarked on a remarkable partnership with Genome BC and Fisheries and Oceans Canada. This partnership, called the Strategic Salmon Health Initiative, was started for a variety of reasons, the primary one being the high mortality rate of juvenile salmon during their early ocean migration. There is a strong belief within the scientific community that infectious disease may be a significant factor in this mortality, but not enough is known about what disease agents might affect Pacific salmon in their natural habitats. What is known comes almost exclusively from observations of cultured fish (both in hatcheries and aquaculture). The initiative intends to clarify the presence and/or absence of microbes in Pacific salmon.
Click Here to access new findings from the Strategic Salmon Health Initiative (SSHI) related to Piscine orthoreovirus (PRV) in British Columbia.
View the full publication list for the Strategic Salmon Health Initiative here: Click Here
Dr. Kristi Miller (Saunders) is an aquatic molecular biologist with expertise in genetics, genomics, transcriptomics, immunogenetics, and fish health, with research on Pacific and Atlantic salmon spanning 27 years. Fisheries and Oceans Canada; University of British Columbia (adjunct).
Learn more about the project and Genome BC: http://www.genomebc.ca/index.php?cID=1235
Read the press release
Read the backgrounder
Models informed by a decade of infection data in juvenile Chinook salmon sampled during early marine residence has revealed that temperature is the most significant driver of infection, with exposure to aquaculture, proximity to freshwater, age at ocean entry, hatchery or wild origin, stock, and latitude associated with a more limited number of pathogens.
Models are also beginning to resolve the pathogens most closely correlated with year-class strength, some transmitted in freshwater, and others in the early marine environment. Climate warming is a major factor for salmon to contend with. Impacts can directly cause stress in salmon, but also indirectly impact prey availability and predator distributions, as well as disrupting the natural balance between pathogens and their hosts.
New research from the SSHI was published September 3 in the online journal eLife . Three newly discovered viruses—including one from a group of viruses never before shown to infect fish—have been found in endangered Chinook and Sockeye salmon populations. The impact of these viruses on salmon health isn’t yet known, but we do know that two of the viruses impact the same tissues in salmon as other species, and cause serious diseases in those species. Of note, two of the three viruses were found in wild salmon, one was observed in hatchery facilities and all three were associated with Chinook aquaculture. The paper raises questions about whether these viruses are contributing to declines in wild Chinook and sockeye stocks. Further research is required to understand the full implications of these findings.
Prior to these findings, an outbreak of Heart and Skeletal Muscle Inflamation (or HSMI) was found via the SSHI in fish from one farm. The lesions in the fish are the same as those previously identified by the same histopathologist in farm audit samples collected from farms during 2011-2013. The HSMI finding was formally reported to the industry and Fisheries and Oceans Canada as per the scientific protocol for the project and announced by Fisheries and Oceans Canada <click here for the release>. As HSMI is not an OIE reportable disease, it was not reported to the Canadian Food Inspection Agency. A slide presentation on the HSMI finding can be viewed here.
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